[ARM] ignore high memory with VIPT aliasing caches

VIPT aliasing caches have issues of their own which are not yet handled.
Usage of discard_old_kernel_data() in copypage-v6.c is not highmem ready,
kmap/fixmap stuff doesn't take account of cache colouring, etc.
If/when those issues are handled then this could be reverted.

Signed-off-by: Nicolas Pitre <nico@marvell.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4810a4c9ffce..cf504885a5fb 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -18,6 +18,7 @@
 #include <asm/cputype.h>
 #include <asm/mach-types.h>
 #include <asm/sections.h>
+#include <asm/cachetype.h>
 #include <asm/setup.h>
 #include <asm/sizes.h>
 #include <asm/tlb.h>
@@ -678,6 +679,10 @@ static void __init sanity_check_meminfo(void)
                         if (meminfo.nr_banks >= NR_BANKS) {
                                 printk(KERN_CRIT "NR_BANKS too low, "
                                                  "ignoring high memory\n");
+                        } else if (cache_is_vipt_aliasing()) {
+                                printk(KERN_CRIT "HIGHMEM is not yet supported "
+                                                 "with VIPT aliasing cache, "
+                                                 "ignoring high memory\n");
                         } else {
                                 memmove(bank + 1, bank,
                                         (meminfo.nr_banks - i) * sizeof(*bank));